Smoke consuming furnace.



` No. 872,373. PATENTED DEC. 3, 1907. G. RVR. ROTHENBUCHBR. SMOKE CONSUMING FURNACE.

APPLICATION .FILED DBO. 1,1906.

3 SHEETS-SHEET 1.

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G. E. R. ROTHENBUCHER. SMOKE CONSUMING FURNACE.

APPLIOATION FILED DBO. 1,1906.

3 SHEETS-SHEET 2.

G. E. R. ROTHBNBUCHER. SMOKE CONSUMING FURNACE.

APPLICATION FILED DEU. 1,1906.

3 SHEETS-SHEET 3 @2M/Imaam GEORGE E. R. ROTHENBUGHER, OF NEW YORK, N. Y.

SMOKE-CONSUMIN G FURNACE Specificationof Letters Patent.

Patented Dec. 3, 1907.

Application illed December l. 1906. Serial No. 345.969.

To all whom it may concern:

Be it' known that I, GEORGE E. R. ROTH- ENBUonEn, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New i ork, have invented certain new and useful l1nprove ments 1n Smoke-Consuming Furnaces, ol `which the following 1s a specification, reference being had therein to the accompanying drawings, 1n wlncl1-.

llgure l 1s a horizontal sectional view of a furnace provided with my invention; Fig. 2 a

transverse vertical, sectional view thereof; Fig. 3 a front view; Fig. 4 a transverse vertical sectional view of the steam and airinjecting means; Fig. 5 a longitudinal sectional view of the steam and air injecting means; Figs. 6 and 7 detail views of the fan hub.

The main object of the invention is to provide an improved furnace in which cheap fuel, such as shavings and refuse from saw mills, soft coal, &c., will be entirely consumed Within the fire box, or combustion chamber, thereby preventing the escape of carbon particles in the form of smoke. Another object of the invention is to rovide means whereby exhaust steam andp air may be delivered under a suitable pressure, and in the proper direction, over the fire in the fire box and upward through the bridge AWall to promote com lete combustion.

A further object o the invention is to provide simplified and improved means operated by exhaust steam for supplying air to the fire box.

Other objects of the invention, relating more particularly to details of construction, will be fully hereinafter described and particularly pointed out in the claims.

The particular construction of furnace shown in the drawings and described herein, but notclaimed, is embodied in my cependng a plicaton for patent for furnace, filed `Marc 1 12, 1907, Serial Number 362,048.

Referring to the various parts by numerals, 1 designates the boiler front, 2 the fire box and 3 the bridge wall. In the side walls of the furnace, a suitable distance above the grate 4, are steam and air flues 5, one of said flues being `in each wall and extending the full length of the fire box, parallel with the side walls thereof. Each of these flues is formed of three interlocked cast iron tubular sections or boxes (i which opon'into each other and whose inner surfaces are'ilush with the inner surface of the side wall of the furnace. On the. inner faces of these tubular sections are formed heating and deflector walls 7 which incline inward and rearward at an angle of forty-five degrees with respect to the side wall of the furnace. Each section 6 is formed with slits or openings S which extend inward through the wall of the section from the inner end of the deflect-or wall 7 and at the same angle as said deflector wall. The result of this is that thin vertical streams of mixed exhaust steam and air flow outward through said slits over the deflector walls and into'the fire box. The deflector walls form the forward sidesof angular projections on the face of the sections 6, said projections being V-shaped in plan view. As these rojections extend into the fire box it will be readily seen that they become highly heated and that the deflector walls serve as heating surfaces for the mixed exhaust steam and an.

The bridge wall 8 is formed at its upper edge with a cellular structure having horizontal passages 9, said passages being formed by suitable brick work. In the bridge Wall along the base of these passages is arranged a transverse flue or pipe 10 wlich connects at its ends with the rear ends of the side flues 5.

The Hue 10 is very much smaller in capacity than the ilues 5 and is connected to these latter flues near the bottoms thereof. The object ol' this is to hold the larger proportion of steam and air in the 'line 5 and to permit only a small portion thereof to pass into the flue This latter flue or pipe is perforated,

1U. said perforations opening into the passages 9 so that the steam and air will be directed into said passages to there mingle with the fiame and products of combustion from the'fire box. lt will bereadily understood that the pipe l0 will become highly heated and will thereby act as a super ieater to the mixed air and steam, and that said mixture will pass into the passages Qin a very dry condition and will assist greatly in promoting combustion.

To supply air and exhaust steam to the forward ends of the lines 5, l 'provide for each flue a tubular conveyer 11 and mount therein suitable steam-driven air-driving means, b which air will be forced into the flue throug the eonveyer together with the roper proportion of exhaust steam. The orward end lof cach conveyor' projects beyond the front wall of the furnace a suitable distance, said eonveyer being secured to"thc furnace wall 

